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Chapter 13 FlexRay Communication Controller (FLEXRAY)
MC9S12XF - Family Reference Manual, Rev.1.19
Freescale Semiconductor
535
13.5.2.66 Message Buffer Conguration, Control, Status Registers (MBCCSRn)
Write: MCM, MBT, MTD: POC:cong or MB_DIS
CMT: MB_LCK
EDT, LCKT, MBIE, MBIF: Normal Mode
The content of these registers comprises message buffer conguration data, message buffer control data,
message buffer status information, and message buffer interrupt ags.
Module Base + 0x0100 (MBCCSR0)
Module Base + 0x0108 (MBCCSR1)
...
Module Base + 0x01F8 (MBCCSR31)
Additional Reset: CMT, DUP, DVAL, MBIF: Message Buffer Disable
15
14
13
12
11
10
9876543210
R0
MCM
MBT
MTD
CMT
0
MBIE
0
DUP
DVAL
EDS
LCKS MBIF
W
rwm
EDT
LCKT
w1c
Reset
0000000000000000
Figure 13-96. Message Buffer Conguration, Control, Status Registers (MBCCSRn)
Table 13-78. MBCCSRn Field Descriptions (Sheet 1 of 3)
Field
Description
Message Buffer Conguration
14
MCM
Message Buffer Commit Mode — This bit applies only to double buffered transmit message buffers and denes
the commit mode.
0 Streaming commit mode
1 Immediate commit mode
13
MBT
Message Buffer Type — This bit applies only to transmit message buffers and denes the buffering type.
0 Single buffered transmit message buffer
1 Double buffered transmit message buffer
12
MTD
Message Buffer Transfer Direction — This bit denes the transfer direction of the message buffer.
0 Receive message buffer
1 Transmit message buffer
Message Buffer Control
11
CMT
Commit for Transmission — This bit applies only to transmit message buffers and indicates whether the
message buffer contains valid data that are ready for transmission. Both the application and the FlexRay block
can modify this bit.
Application: The application sets this bit to indicate that the transmit message buffer contains valid data ready
for transmission. The application clears this bit to indicate that the message buffer data are no longer valid for
transmission.
FlexRay block: The FlexRay block clears this bit when the message buffer data are no longer valid for
transmission.
0 Message buffer does not contain valid data.
1 Message buffer contains valid data.